Tissue Fluid
- Created by: Jasmine
- Created on: 13-01-17 12:00
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- TISSUE FLUID
- surrounds cells in tissues
- made from substances that leave the blood plasma
- eg oxygen, water and nutrients
- does not contain red blood cells or big proteins
- too large to be pushed out through the capillary walls
- cells take in oxygen and nutrients from the tissue fluid
- metabolic waste is released into tissue fluid
- in the capillary bed, substances move out of the capillaries and into tissue fluid by PRESSURE FILTRATION
- at the start of the capillary bed, nearest the arteries
- hydrostatic pressure inside the capillaries is greater than the hydrostatic pressure in the tissue fluid
- the difference in hydrostatic pressure forces fluid out of the capillaries and into the space around the cells
- forms tissue fluid
- as water leaves the capillaries, concentration of plasma proteins in the capillaries increase and water potential decreases
- plasma proteins generate a pressure called oncotic pressure
- at the venule end of the capillary bed, there is a high oncotic pressure and low water potential
- due to the water potential in the capillaries being lower than the water potential in the tissue fluid, water re-enters the capillaries at the venule end by osmosis
- at the venule end of the capillary bed, there is a high oncotic pressure and low water potential
- plasma proteins generate a pressure called oncotic pressure
- at the start of the capillary bed, nearest the arteries
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